Following an injury to his arm, a patient complains that he has lost the ability to flex his elbow and supinate his forearm. You suspect that he has damaged the
A. median nerve.
B. radial nerve.
C. musculocutaneous nerve.
D. ulnar nerve.
E. axillary nerve.
Answer: C
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What is the correct sequence of steps in bone repair? 1. Cartilage in the external callus is replaced by bone. 2. A hematoma occurs. 3. An internal callus forms at the site of injury. 4. Osteoclasts and osteoblasts remodel the bone at the site of repair
A) 1, 2, 3, 4 B) 2, 1, 3, 4 C) 3, 1, 4, 2 D) 4, 2, 3, 1 E) 2, 3, 1, 4
What is the best description of a tetanic contraction in a skeletal muscle cell?
A. A single action potential in the motor neuron causes a sustained contraction. B. Multiple action potentials in the motor neuron cause a sustained contraction. C. The action potential in the muscle cell is prolonged to last as long as the contraction. D. Repeated action potentials from the motor neuron summate into a sustained depolarization of the motor end plate, causing a sustained contraction. E. A very large amplitude action potential in the motor neuron causes a very strong contraction in the skeletal muscle cell.
Which of the following is NOT a short-term response to hemorrhaging?
a. ADH and aldosterone promote fluid retention b. venoconstriction mobilizes venous return c. ADH and angiotensin II enhance vasoconstriction d. Carotid and aortic reflexes increase cardiac output
The collar that forms around the opposing ends of bone fragments is called a/an ________.
A. hematoma B. osteon C. external callus D. internal callus E. epiphysis